RE: RE: Re: [chrony-users] Chrony 3.1 refuses to sync with ntp server

[Bill Unruh <unruh@xxxxxxxxxxxxxx>]

On Wed, 29 Nov 2017, Assaf Vainsencher wrote:

> I'm not really sure but I think as long as chrony syncs with the NTP server that it's acceptable  for our needs.  That being said, could it be that both the NTP server (windows 2008R2) and the clients are on Vmware virtual machines?  If is there a setting for the vmware VM or chrony to improve the dispersion?  What's the downside of high dispersion?

The downside is potentialy bad time. If the roundtrip for example is 5 sec and
has a 2 sec asymmetry (1.5 sec up and 3.5 down) then your time will be off by
a second, etc.(Your sneakernet deliverer stolls one way and runs the other).
A better idea is to get a cheap Linux machine or bsd machine (eg a Raspberry
Pi) and use it as your time delivery machine instead of bad Windows machines.



> Asasaf Vainsencher
> Raytheon IIS
> 22110 Pacific Blvd, Dulles
> w. 571-250-3824
> c. 571-294-8082
>
>
> -----Original Message-----
> From: Bill Unruh [mailto:unruh@xxxxxxxxxxxxxx]
> Sent: Tuesday, November 28, 2017 9:14 PM
> To: chrony-users@xxxxxxxxxxxxxxxxxxxx
> Subject: [External] RE: Re: [chrony-users] Chrony 3.1 refuses to sync with ntp server
>
>
> On Tue, 28 Nov 2017, Assaf Vainsencher wrote:
>
> > Thank you.  I confirmed that using maxdistance 16 fixed the issue we're seeing.  Looks like our root dispersion is just over 10 which is why we were seeing the issue with the default setting in version 3.1.
>
> Off topic, but I am really surprized by such a huge root dispersion. Are the ntp packets being delivered by sneakernet?
>
> Why would one want to use a timesource with such a huge dispersion/delay?
>
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